What should I wear for cousin's wedding next May?

[baahhumbug]

My cousin is getting married next May and we are going to the registry office wedding and afternoon do.

I live in jeans and tshirts most of the time so please help me find something to wear, shoes as well (I hate heels)!

I'm 48, size 12, have dark brown long wavy hair, brown eyes and medium sort of skin. Haven't had my colours done although am thinking about it.

Thanks - I'm hopeless at this sort of thing.

I meant to add that I prefer v or scoop neckline (size dd boobs!) and that I have virtually no waist

www.phase-eight.co.uk/fcp/product/phase-eight/Dresses/Miracle-Dress/201961424

Do you like this?

www.phase-eight.co.uk/fcp/product/phase-eight/Dresses/Josie-Drape-Dress/201858060

Thanks. Not keen on the miracle dress but quite like the drape dress, just not sure if my cousin is wearing ivory, in which case that might be a bit pale for a wedding?

I like the length, knee length is good. I've resigned myself to the fact that I will have to wear heels (will have to buy some too as I just don't have any other than black sandals).

I quite like this www.phase-eight.co.uk/fcp/product/phase-eight/Dresses/Betty-Print-Dress/201755298 although I don't usually "do" flowery or pink! Is it too old?

Are Phase Eight quite true to size? Haven't bought anything there before and also have just lost a stone, haven't been a size 12 for a few years. I might have to order two sizes just in case.

I quite like this cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230839971928&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en, but is it a bit too "eveningy"?